Wells – With explosive or gas generating means in well
Patent
1985-04-12
1986-11-04
Novosad, Stephen J.
Wells
With explosive or gas generating means in well
166 55, 166212, E21B 2902
Patent
active
046205918
ABSTRACT:
A chemical cutting apparatus for use within a well bore is disclosed. The apparatus of the present invention includes a tubular casing adapted to be lowered into a well bore. The tubular casing contains an internal chamber containing a chemical cutting fluid. A remotely operated explosive charge pressurizes the chamber of chemical cutting fluid and simultaneously forces chemical cutting fluid out through a discharge passage and erects a plurality of slips which anchor the tubular casing within the well bore. After a cutting operation has taken place, pressure buildup within the tubular casing which occurs as a result of a clogged discharge passage may be vented or bled off by the selective opening of a second discharge passage, thus preventing undesired engagement of the anchor slips during removal of the apparatus. In a preferred embodiment of the present invention, an interlock is provided which prevents the opening of the second discharge passage prior to ignition of the explosive charge.
REFERENCES:
patent: 4250960 (1981-02-01), Chammas
patent: 4315797 (1982-02-01), Peppers
patent: 4415029 (1983-11-01), Pratt et al.
patent: 4494601 (1985-01-01), Pratt et al.
Pratt Donna K.
Terrell Jamie B.
Bui Thuy M.
Gearhart Industries, Inc.
Novosad Stephen J.
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